Improvement in printing-telegraphs



THOMAS A. EDISON.

Improvement in Printing-Telegraphs. No. 126,530, Patented May 7,1872.

AM. rl-mrwumosnn Fww ca M x (ossonus's Pnncsss) UNITED STATES PATENTOFFICE THOMAS A. EDISON, OF NEWARK, NEW JERSEY, ASSIGNOR TO GOLD ANDSTOCK TELEGRAPH COMPANY, OF NEW YORK CITY.

IMPROVEMENT IN PRlNTlNG-TELEGRAPHS.

Specification forming part of Letters Patent No. 126,530, dated May 7,1872.

To all whom it may concern Be it known that I, THOMAS A. EnIsoN, ofNewark, in the county of Essex and State of New Jersey, have inventedand made a new and useful Improvement in Printing-Telegraphs; and thefollowing is declared to be a full and correct description of the same.

My present invention consists of a printingtelegraph instrument in whichthe type-wheel is revolved and the printing and feedingmechanismoperated by a movement communicated from the same armature ofan electro-magnet. I make use of a type-wheel revolved by a stepby-stepmovement derived from the vibration of the armature of anelectro-magnet, and between lateral arms from the cores of saidelectro-magnet is a swinging polarized bar, which, when attracted towardone of said arms by magnetism induced by a current of one polarity,allows the armature to be vibrated by pulsations of the same polarityand the typewheel to be revolved; but a stop on said bar setting over aprojection on the armature limits the upward movement of the armatureand prevents the printing and feeding mechanism acting until the currentis reversed, which then throws the polarized bar to the other pole ofthe electro-magnet, disconnectingthe stop from the armature and allowingthe same to have its full upward and downward movement to efiect theprinting andfeed of the paper.

In the drawing, Figure 1 is a plan of my improved instrument. Fig. 2 isan elevation of the same with the type-wheel removed, but its positionshown by dotted lines. Figs. 3 and 4 are detached views illustrating thedevice which limits the movement of the armature, and Fig. 5 is asectional view of a portion of the feeding device.

The electro-magnet a a is supported in a frame, a upon the base b, andthe armature c of said magnet is secured to the lever c, which swingsupon the screw-centers d d. The spring 0 gives the upward movement tosaid lever c and the parts connected to it. his the type-wheel, upon asleeve fitted to revolve freely on a gudgeon extending from the frame aand to this sleeve is secured the ratchetwheel t, which is turned, torotate the typewheel, by the pawl l pivoted upon the vertical bar on.This bar m is connected at its upper part by a joint, 2, to the lever c,which allows a free vertical movement to the bar, and it is guided bythe pin and slot 3. This bar is made with an opening so as to passaround the gudgeon and sleeve of the type-wheel, and said bar carriesthe impression-pad n and paper-feeding dog or clamp 0. p is thepolarized bar between the lateral arms of the cores of the magnet a aand it swings upon the center 15. At the top and upon one side of thebar 10 is a stop, 5, and upon the under side of the armature c is anL-shaped projection or stop, 6. When a pulsation of one polarity is sentthrough the magnet a the bar 19 is repelled from the core or arm of themagnet a, and attracted to the position shown most clearly in Fig. 3,where the stop 5 is immediately over the stop 6, and in thisposition'the armature can be vibrated by pulsations of that polarity andthe type-wheel revolved by the lever 0, bar m, pawl l, and ratchet i, tobring the desired letter in position for printing; but an impressionwill not be made, because the stops 5 and 6 limit the motion of thearmature and prevent the lever c and connected parts receiving the fullupward movement necessary for printing. lVhen the polarity of thecurrent is reversed the bar 12 is attracted by the magnet a whichdisconnects the stops 5 and 6 and allows the spring 0 to give the fullupward movement to the lever 0, bar 122, and impression-pad n, andefl'ect the printing before the accumulation of force in the-magnet a ais sufficient to draw down the armature and feed the paper at the sametime that the type-wheel is moved. The full downward movement of thelever c and bar m actuates the dog 0 and feeds the paper the properdistance. The polarity of the current is now reversed, and the bar pwill be moved to its normal position with the stop 5 over the projection6; but there is sufficient play to allow the armature c to be vibratedso that the necessary movement is given to the lever 0, bar m, and pawll to rotate the ratchet-wheel iand type-wheel h as before. A pin, t,upon the frame (1 takes against the under side of the pawl l and liftsit from contact with the teeth of i, when the full downward movement isgiven to the bar m, and prevents said wheel being turned more than onetooth by such downward motion of the bar. u is a set-screw to determinethe downward movement of the bar on and stop the rotation of theratcheti and type-wheel h, and L is a pawl to prevent the ratchet 1'turning backward. The paper passes over the table wand beneath thespringfingers S 8, and in this table is an opening to allow the pad n topress the paper against the type-wheel and make the impression. Thefeeding-dog 0 is, at the outer end of an arm, 12, pivoted to the bar m,and at the side of this dog 0 is a pin, 9. \Vhen the type-wheel is beingrotated the pin 9 slides up and down a yielding incline, 10, (see Fig.5,) which keeps the dog 0 off of the paper; but upon the iull upwardmovement being given to the bar I to etfect the printing the pin 9 ismoved up over the top of 10, and falls to the rear of said incline,bringing the dog in contact with the paper, and upon the full downwardmovement of the bar m the pin 9 slides under this incline 10, and thedog 0 feeds the paper forward the required distance. This incline 10 isat the outer end of an arm, 13, that is kept to the table uby the spring14 so as to be raised by the pin 9 running beneath it, and then said pin9 plays upon the surface of 10, keeping the dog 0 from contact with thepaper while the type-wheel is being moved.

I claim as my invention 1. The bar p and stops 5 and 6 to regulate theextent of motion allowed to the armature c of an electro-magnet,substantially as set forth.

2. A type-wheel rotated by a step-by-step motion and an impression-padmoved simultaneously, in combination with an electro-magnet andmechanism for regulating the extent of motion of the armature for movingthe type-wheel or effecting the impression, substantially as set forth.

3. The yielding incline 10 and paper-feeding pawl 0, brought into actionby an increased movement of the armature of an electro-magnet,substantially as set forth.

4. An impression-pad moved by a spring to give the impression when thecurrent is broken in an electro-magnet, in combination with atype-wheel, substantially as set forth.

Signed by me this 14th day of February, A. D. 1872.

Witnesses: T. A. EDISON.

Units. H. SMITH, GEo. T. PINOKNEY.

